public class Test {
    public static void main(String[] args) {
        TreeNode root = new TreeNode(1);
        TreeNode root1 = new TreeNode(2);
        TreeNode root2= new TreeNode(3);
        TreeNode root3 = new TreeNode(4);
        root.left = root1;
        root1.left = root3;
        root.right = root2;
        Solution solution = new Solution();
        int[] arr1 = {9,3,15,20,7};
        int[] arr2 = {9,15,7,20,3};
        //solution.lowestCommonAncestor(root,root3,root1);
        System.out.println("1");
    }
}
